摘要
以竹纤维素再生膜为基膜,海藻酸钠和羧甲基纤维素的共混溶液为涂覆液,环氧氯丙烷为交联剂,采用交联法制备了一种新型纤维素复合纳滤膜。研究了纳滤膜的制备工艺和对NaCl、Na_2SO_4、MgCl_2、MgSO_4、CaCl_2(500 mg/L)的截留性能。结果表明,在海藻酸钠与羧甲基纤维素共混溶液质量分数2.0%、共混比1∶3、环氧氯丙烷质量分数3.0%条件下,纤维素复合纳滤膜的膜通量为13.75 L/(m^2·h),Na Cl截留率为48.15%,较纤维素再生膜的膜通量(487.81 L/(m^2·h))下降明显,较纤维素再生膜的截留率(1.52%)有明显提高。对几种无机盐的截留性能顺序为:Na_2SO_4﹥Mg SO4﹥Na Cl﹥Mg Cl2﹥Ca Cl2。相比纤维素再生膜,纤维素复合纳滤膜的抗张力为83.31 N,比纤维素再生膜的抗张力(46.65 N)提高了44.0%,膜伸长量4.7 mm,伸长率9.40%,抗张强度5.554 k N/m,机械性能相对提高。
The regenerated bamboo cellulose membrane(BCM) was used as base film, sodium alginate(ALG) and carboxymethyl cellulose (CMC) were applied as the active layer coating solution, and the epichlorohydrin(ECH) was used as cross-linking agent to prepare a bamboo cellulose based nanofiltration membrane(CL-NF-BCM) by cross-linking methodin the study. The membrane preparation process and the retention performances of different salts, such as NaCl, Na2SO4, MgCl, MgSO4 and CaCl2 (500 ppm) were investigated. The results showed that the water flux of the CL-NF-BCM was 13. 75 L/(m^2· h) and the NaCl retention rate was 48. 15% when the concentration of the mixed coating solution of sodium alginate and carboxymethyl cellulose ( mix ratio = 1 : 3) was 2.0%, and the concentration of epichlorohydrinwas 3.0%. The water flux of BCM was 487. 81 L/(m^2· h), which was significantly higher than CL-NF-BCM, while the rejection of the salt in CL-NF-BCM was significantly higher than BCM, i. e. 1.52%. The retention order of the salts was: Na2SO4 〉 MgSO4 〉 NaCl 〉 MgCl2 〉 CaCl2. The tensile strength of the cellulose membrane was 46. 65 N, the tensile strength of the cross-linked nanofiltration membrane was 83. 31 N, increased 44. 0%, and the cross-linked composite nanofiltration membrane elongation was 4. 7 mm, the rate of elongation was 9. 40%, indicating its mechanical performance increased compared with BCM.
作者
李诗
程雨桐
黄方
林珊
马晓娟
曹石林
陈礼辉
黄六莲
LI Shi, CHENG Yu-tong ,HUANG Fang ,LIN Shan ,MA Xiao-juan ,CAO Shi-lin, CHEN Li-hui ,HUANG Liu-lian(Center for Advanced Bio-based Functional Materials, Fujian Agriculture and Forestry University, Fuzhou, Fujian Provice, 350002)
出处
《中国造纸》
CAS
北大核心
2018年第3期1-7,共7页
China Pulp & Paper
基金
福建省发改委科技重大专项(闽发改高技[2014]514号)
福建省科技厅高校产学合作项目(2016H6004)
关键词
纤维素再生膜
纤维素复合纳滤膜
海藻酸钠
羧甲基纤维素
环氧氯丙烷
cellulose regenerated membrane
nanofiltration membrane
sodium alginate
carboxymethyl cellulose
epichlorohydrin